The postoperative pancreatic fistula (POPF), which determines postoperative mortality, length of hospital stay， is dependent of its definition, and is reported in up to 16% of patients. The purpose of this study is to determine whether the new anastomosis called "nonstented stump-closed" pancreaticojejunostomy can reduce the POPF rate and downgrade compared with the common accepted duct-to-mucosa pancreaticojejunostomy after pancreaticoduodenectomy. This single-centre, open, randomized controlled trail is conducted following International Study Group on Pancreatic Fistula (ISGPF) criteria for pancreatic fistula (PF). The primary endpoint is the POPF rate, and others include overall postoperative complication rate and their severity reoperation rate and hospital stay.